FRS comparative analysis of the nuclear power plant considering SSI effect

Background: In the framework of lumped-parameter numerical models, the traditional soil dynamic impedance models, recommended by the main international seismic design codes of the nuclear power plant, are only expressed by a single parallel connection system of spring and damper. Purpose: In order to combine the recent development of soil-structure interaction analysis. Methods: Comparative study of both the direct method and substructure method history analysis is carried out based on the lumped parameter models recommended by seismic design codes of ASCE4-98, RCCG which are both applicable to the homogeneous site and also massless foundation model and viscous-spring artificial boundary model of especially fit for the numerical simulation of non- homogeneous site. Results: Finally, by taking the analysis of FRS for a certain CPR1000 reactor plant as an example, comparison analyses of homogeneous and inhomogeneous layer site conditions for various soil dynamic numerical models above-mentioned are carried out. In addition, the calculated results are compared to that of SASSI program. It can be concluded that the calculation results are similar based on different methods. Conclusions: This paper validates the applicability of different soil dynamic numerical models mentioned above and will provide some reference and guidance significance in the aspect of evaluation the seismic suitable for the site of nuclear power plant. (authors)